Define a class named doctor whose objects are records for a clinic's doctors. derive the class from the class person (given before in lectures). a doctor record has the doctor's name defined in the class person a specialty as a string (for practitioner, and so on), and an office-visit fee (use the type double) give your class at least three constructors, accessor & mutator methods (set and get methods), and a writeoutput method as well. write a test program that creates at least two doctors and test your methods